No. 1 doctor recommended brand. Immune system support (with nutrients for support immune system: protein, vitamin A, vitamin D, zinc, antioxidants (vitamins C & E and selenium). Vitamin D with nutrients for immune system support. 75% more protein than Ensure original (Ensure high protein - 16 g protein per 8 fl oz. Ensure original - 9 g protein per 8 fl oz). 27 vitamins & minerals.